Re: [PATCH v2 3/3] dt-bindings: mtd: Document use of nvmem-partitions compatible

[Rafał Miłecki]

On 05.03.2021 23:23, Rob Herring wrote:
> On Wed, Mar 03, 2021 at 11:01:55AM +0100, Rafał Miłecki wrote:
> > [Rob: please advise]
> >
> > On 16.02.2021 22:26, Ansuel Smith wrote:
> > > Document nvmem-partitions compatible used to treat mtd partitions as a
> > > nvmem provider.
> >
> > Until now we were using "compatible" string in partition node only for
> > parsers (looking for subpartitions). We need to think if this change can
> > break anything from DT / Linux perspective.
> >
> > Compatible strings should be unique, so there is no risk of conflict
> > between NVMEM and parsers.
> >
> > Now: can we ever need mtd partition to:
> > 1. Contain subpartitions
> > 2. Provide NVMEM
> > at the same time?
> >
> > Let's say:
> >
> > partition@0 {
> > 	compatible = "vendor,dynamic-firmware-partitions", "nvmem-partitions";
>
> I think you'd want the "vendor,dynamic-firmware-partitions" parser/code
> to serve up any nvmem regions. Whether you have a fallback here depends
> if an OS could make use of the regions knowing nothing about
> "vendor,dynamic-firmware-partitions".

Perfect! I didn't think that driver handling
"vendor,dynamic-firmware-partitions" may also take care of NVMEM.

Thank you.